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    <title>Custom Animation</title>
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          <h4 id="title">Custom Animation</h4>
          <div id="map" class="map"></div>

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          <p id="shortdesc">Demonstrates how to animate features.</p>
          <div id="docs"><p>This example shows how to use <b>postcompose</b> and <b>vectorContext</b> to animate features. Here we choose to do a flash animation each time a feature is added to the layer.</p>
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          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.Observable.html" title="API documentation for ol.Observable">ol.Observable</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.control.html" title="API documentation for ol.control">ol.control</a></li>,<li><a href="../apidoc/ol.easing.html" title="API documentation for ol.easing">ol.easing</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li></ul></div>
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          <textarea class="hidden" name="title">Custom Animation</textarea>
          <textarea class="hidden" name="description">Demonstrates how to animate features.</textarea>
          <textarea class="hidden" name="js">var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM({
        wrapX: false
      })
    })
  ],
  controls: ol.control.defaults({
    attributionOptions: {
      collapsible: false
    }
  }),
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 1
  })
});

var source &#x3D; new ol.source.Vector({
  wrapX: false
});
var vector &#x3D; new ol.layer.Vector({
  source: source
});
map.addLayer(vector);

function addRandomFeature() {
  var x &#x3D; Math.random() * 360 - 180;
  var y &#x3D; Math.random() * 180 - 90;
  var geom &#x3D; new ol.geom.Point(ol.proj.transform([x, y],
      &#x27;EPSG:4326&#x27;, &#x27;EPSG:3857&#x27;));
  var feature &#x3D; new ol.Feature(geom);
  source.addFeature(feature);
}

var duration &#x3D; 3000;
function flash(feature) {
  var start &#x3D; new Date().getTime();
  var listenerKey;

  function animate(event) {
    var vectorContext &#x3D; event.vectorContext;
    var frameState &#x3D; event.frameState;
    var flashGeom &#x3D; feature.getGeometry().clone();
    var elapsed &#x3D; frameState.time - start;
    var elapsedRatio &#x3D; elapsed / duration;
    // radius will be 5 at start and 30 at end.
    var radius &#x3D; ol.easing.easeOut(elapsedRatio) * 25 + 5;
    var opacity &#x3D; ol.easing.easeOut(1 - elapsedRatio);

    var style &#x3D; new ol.style.Style({
      image: new ol.style.Circle({
        radius: radius,
        snapToPixel: false,
        stroke: new ol.style.Stroke({
          color: &#x27;rgba(255, 0, 0, &#x27; + opacity + &#x27;)&#x27;,
          width: 0.25 + opacity
        })
      })
    });

    vectorContext.setStyle(style);
    vectorContext.drawGeometry(flashGeom);
    if (elapsed &gt; duration) {
      ol.Observable.unByKey(listenerKey);
      return;
    }
    // tell OpenLayers to continue postcompose animation
    map.render();
  }
  listenerKey &#x3D; map.on(&#x27;postcompose&#x27;, animate);
}

source.on(&#x27;addfeature&#x27;, function(e) {
  flash(e.feature);
});

window.setInterval(addRandomFeature, 1000);
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
</textarea>
          <input type="hidden" name="resources" value="https://openlayers.org/en/v4.6.5/css/ol.css,https://openlayers.org/en/v4.6.5/build/ol.js">
          <input type="hidden" name="data">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Custom Animation&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;script&gt;
      var map &#x3D; new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM({
              wrapX: false
            })
          })
        ],
        controls: ol.control.defaults({
          attributionOptions: {
            collapsible: false
          }
        }),
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: [0, 0],
          zoom: 1
        })
      });

      var source &#x3D; new ol.source.Vector({
        wrapX: false
      });
      var vector &#x3D; new ol.layer.Vector({
        source: source
      });
      map.addLayer(vector);

      function addRandomFeature() {
        var x &#x3D; Math.random() * 360 - 180;
        var y &#x3D; Math.random() * 180 - 90;
        var geom &#x3D; new ol.geom.Point(ol.proj.transform([x, y],
            &#x27;EPSG:4326&#x27;, &#x27;EPSG:3857&#x27;));
        var feature &#x3D; new ol.Feature(geom);
        source.addFeature(feature);
      }

      var duration &#x3D; 3000;
      function flash(feature) {
        var start &#x3D; new Date().getTime();
        var listenerKey;

        function animate(event) {
          var vectorContext &#x3D; event.vectorContext;
          var frameState &#x3D; event.frameState;
          var flashGeom &#x3D; feature.getGeometry().clone();
          var elapsed &#x3D; frameState.time - start;
          var elapsedRatio &#x3D; elapsed / duration;
          // radius will be 5 at start and 30 at end.
          var radius &#x3D; ol.easing.easeOut(elapsedRatio) * 25 + 5;
          var opacity &#x3D; ol.easing.easeOut(1 - elapsedRatio);

          var style &#x3D; new ol.style.Style({
            image: new ol.style.Circle({
              radius: radius,
              snapToPixel: false,
              stroke: new ol.style.Stroke({
                color: &#x27;rgba(255, 0, 0, &#x27; + opacity + &#x27;)&#x27;,
                width: 0.25 + opacity
              })
            })
          });

          vectorContext.setStyle(style);
          vectorContext.drawGeometry(flashGeom);
          if (elapsed &gt; duration) {
            ol.Observable.unByKey(listenerKey);
            return;
          }
          // tell OpenLayers to continue postcompose animation
          map.render();
        }
        listenerKey &#x3D; map.on(&#x27;postcompose&#x27;, animate);
      }

      source.on(&#x27;addfeature&#x27;, function(e) {
        flash(e.feature);
      });

      window.setInterval(addRandomFeature, 1000);
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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